Update NetLog to be thread safe.

net/base/net_log.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_BASE_NET_LOG_H_
 #define NET_BASE_NET_LOG_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 11 matching lines @@
 
 // NetLog is the destination for log messages generated by the network stack.
 // Each log message has a "source" field which identifies the specific entity
 // that generated the message (for example, which net::URLRequest or which
 // SocketStream).
 //
 // To avoid needing to pass in the "source id" to the logging functions, NetLog
 // is usually accessed through a BoundNetLog, which will always pass in a
 // specific source ID.
 //
-// Note that NetLog is NOT THREADSAFE.
-//
 // ******** The NetLog (and associated logging) is a work in progress ********
 //
 // TODO(eroman): Remove the 'const' qualitifer from the BoundNetLog methods.
-// TODO(eroman): Make the DNS jobs emit into the NetLog.
 // TODO(eroman): Start a new Source each time net::URLRequest redirects
 //               (simpler to reason about each as a separate entity).
 
 class NetLog {
  public:
   enum EventType {
 #define EVENT_TYPE(label) TYPE_ ## label,
 #include "net/base/net_log_event_type_list.h"
 #undef EVENT_TYPE
   };
@@ skipping 221 matching lines @@
   virtual Value* ToValue() const;
 
  private:
   const char* name_;
   const NetLog::Source value_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_LOG_H_